We have been using Scala pretty heavily since 2008 at Capital IQ (capitaliq.com) and ClariFI (http://clarifi.com/ http://clarifi.com/) - check out this writeup

We have been using Scala pretty heavily since 2008 at Capital IQ (capitaliq.com) and ClariFI (http://clarifi.com/ http://clarifi.com/) - check out this writeup - http://pchiusano.blogspot.com/2009/08/scala-success-story-commercial-usage-of.html http://pchiusano.blogspot.com/2009/08/scala-success-story-co.... Since then we've only increased our usage and it's been working out extremely well.